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Tubafore 03-23-2013 08:37 PM

Maximum roof overhang.
I am in the process of designing my home addition and have a gotten to the roof. The IRC gives a maximum of 24" for roof overhangs. Does this include drip edges that protrude or rain gutters, or is it just the wood structure?

Also I am putting rigid foam on the outside of my walls so I will have about 2 1/2" of material past the sheathing. Do I start measuring from the sheathing or the outer surface of the walls?


jagans 03-23-2013 08:56 PM

I would say 2 feet beyond the exterior of the structural wall. I would not worry about a 1x fascia. You going with EIFS?

Tubafore 03-23-2013 09:10 PM

No EIFS. The wall will be, studs>sheathing>rigid foam>furring strips>lap siding.
I wasn't sure if the 24" limit was purely a structural/roof loading concern. In which case I should exclude the non load bearing elements of the wall.

cleveman 03-23-2013 09:19 PM

This sounds like horse puckey to me. How can there be a building code telling you that you can only have a max. 2' soffit? There are plenty of 4' soffits around here, and I don't see any storm damage. A porch is not much different than an 8' soffit.

concretemasonry 03-23-2013 10:40 PM

The IRC is a national model code that can be adopted by reference by a state, county or city and is a minimum that can be made stricter by a local authority, but not to a lesser standard.

I would think that the "overhang" and what is included (drips, gutters, etc.) may be a zoning or property standard, but for structures, it is not worth splitting hais about.

If you have roof trusses designed for a home, they can be designed and supplied with a engineers structural adequacy for structural purposes even with an overhang from the structural wall that trumps the maximum, but you must respect the local zoning requirements.


ddawg16 03-23-2013 11:41 PM

My house has overhangs that are a little over 24" (as measured from the horiz).....considering that the rafters are 2x4's....24" is really pushing it....there is some obvious sag in some places. You don't want 2 people in the same spot. For my addition, I also went 24" but I used 2x6's...and 16" OC instead of 24" oc.

I don't think I would want to go over 24"....anything more would look 'odd'....

jagans 03-24-2013 04:48 AM

Are we talking trusses or stick framing? I would agree that over 2 feet would look a little strange, but I see where you are going. I guess you want 2 feet past the finished wall, as that makes sense vis a vis material use. Im sure a properly designed truss can handle that. Can you post the section in the IRC that refers to this?

Tubafore 03-24-2013 08:43 AM

This will be a cathedral ceiling with 2x8 rafters, reduced to 5 1/2" tall after being notched at the top plate. No ceiling joists so the rafters will be forming a cantilever to create the eaves. This should be strengthened by the frame that is built to hold the soffit in place.

The part of the IRC I saw, Although I look back now and realize it is in the section on steel roof framing.

"R804. Eave overhang. Eave overhangs shall
not exceed 24 inches (610 mm) measured horizontally"

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